Pipeline to a Wastewater Collector using Trenchless Pipe Jacking in Offenbach

Two possibilities came into question regarding the realization of the collector: open trench or trenchless installation by jacking. Several reasons spoke in favor of jacking as for instance a forest would have had to have been cleared and private properties as well as farmland would have been affected when opting for an open trench. Apart from this, the costly lowering of the groundwater table with its further impacts on the surrounding ecosystem could be avoided. And very much to the comfort of the inhabitants and environment, noise and emissions from the construction works, heavy transport as well as road diversions and traffic jams were kept to a minimum. Although the tender that was published in July 2007 traditionally suggested the use of kiteshaped concrete profiles, HOBAS Germany convinced the contractor with a well-thought-out centrifugally cast GRP jacking pipe systems. The economic and ecological advantages were obvious: Thanks to the HOBAS Products’ excellent hydraulic properties (k ≤ 0.01) there was no need for kite-profile pipes. The special proposal by HOBAS proved to be economically more attractive than the official suggestion for costs were considerably reduced by shorter installation times and by utilizing tangential shafts instead of cast-in-place concrete structures.